diff --git a/src/knx/device_object.h b/src/knx/device_object.h
index 80b556c..10f171d 100644
--- a/src/knx/device_object.h
+++ b/src/knx/device_object.h
@@ -7,40 +7,40 @@
 class DeviceObject: public InterfaceObject
 {
 public:
-  // increase this version anytime DeviceObject-API changes 
-  // the following value represents the serialized representation of DeviceObject.
-  const uint16_t apiVersion = 1;
-  
-  DeviceObject();
-  uint8_t* save(uint8_t* buffer) override;
-  const uint8_t* restore(const uint8_t* buffer) override;
-  uint16_t saveSize() override;
+    // increase this version anytime DeviceObject-API changes 
+    // the following value represents the serialized representation of DeviceObject.
+    const uint16_t apiVersion = 1;
+    
+    DeviceObject();
+    uint8_t* save(uint8_t* buffer) override;
+    const uint8_t* restore(const uint8_t* buffer) override;
+    uint16_t saveSize() override;
 
-  uint16_t individualAddress();
-  void individualAddress(uint16_t value);
+    uint16_t individualAddress();
+    void individualAddress(uint16_t value);
 
-  void individualAddressDuplication(bool value);
-  bool verifyMode();
-  void verifyMode(bool value);
-  bool progMode();
-  void progMode(bool value);
-  uint16_t manufacturerId();
-  void manufacturerId(uint16_t value);
-  uint32_t bauNumber();
-  void bauNumber(uint32_t value);
-  const uint8_t* orderNumber();
-  void orderNumber(const uint8_t* value);
-  const uint8_t* hardwareType();
-  void hardwareType(const uint8_t* value);
-  uint16_t version();
-  void version(uint16_t value);
-  uint16_t maskVersion();
-  void maskVersion(uint16_t value);
-  uint16_t maxApduLength();
-  void maxApduLength(uint16_t value);
-  const uint8_t* rfDomainAddress();
-  void rfDomainAddress(uint8_t* value);
-  uint8_t defaultHopCount();
+    void individualAddressDuplication(bool value);
+    bool verifyMode();
+    void verifyMode(bool value);
+    bool progMode();
+    void progMode(bool value);
+    uint16_t manufacturerId();
+    void manufacturerId(uint16_t value);
+    uint32_t bauNumber();
+    void bauNumber(uint32_t value);
+    const uint8_t* orderNumber();
+    void orderNumber(const uint8_t* value);
+    const uint8_t* hardwareType();
+    void hardwareType(const uint8_t* value);
+    uint16_t version();
+    void version(uint16_t value);
+    uint16_t maskVersion();
+    void maskVersion(uint16_t value);
+    uint16_t maxApduLength();
+    void maxApduLength(uint16_t value);
+    const uint8_t* rfDomainAddress();
+    void rfDomainAddress(uint8_t* value);
+    uint8_t defaultHopCount();
 private:
     uint8_t _prgMode = 0;
     uint16_t _ownAddress = 65535; // 15.15.255;